SUMMARY: Titans third-string QB Matt Mauck will start on Sunday in Jacksonville. Mauck worked with the first team offense for the second day this week as Steve McNair appears doubtful due to a strained pectorial muscle. Coach Jeff Fisher said Mauck has shown steady improvement this week. "The tempo's been great. He's shaved about eight minutes off both practices the last two days. He's in and out of the huddle. He knows what to do," Fisher said. "So we've just got to wait on Steve and see what happens." Fisher said there's a chance McNair will throw today. If McNair doesn't throw today, Fisher said he thinks "it will be hard" for the veteran to play. What do you think about this article? Post your comments below.